gnu: Add emacs-csound-mode.

* gnu/packages/emacs-xyz.scm (emacs-csound-mode): New variable.

gnu/packages/emacs-xyz.scm

@@ -24141,6 +24141,41 @@ read-only, constant database that maps Emacs Lisp symbols to
 arbitrary Emacs Lisp objects.")
     (license license:gpl3+)))
 
+(define-public emacs-csound-mode
+  (package
+    (name "emacs-csound-mode")
+    (version "0.2.1")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/hlolli/csound-mode")
+             (commit version)))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32
+         "1c88ak0jaj51fwiqniqxd7xyk23wjl9m57znzm8j267ld8g12znp"))))
+    (build-system emacs-build-system)
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'disable-breaking-compilation
+           (lambda _
+             (for-each (lambda (file)
+                         (chmod file #o600) ; needed to write changes.
+                         (emacs-batch-disable-compilation file))
+                       '("csound-font-lock.el"))
+             #t)))))
+    (inputs
+     `(("emacs-highlight" ,emacs-highlight)
+       ("emacs-multi" ,emacs-multi)
+       ("emacs-shut-up" ,emacs-shut-up)))
+    (home-page "https://github.com/hlolli/csound-mode")
+    (synopsis "Emacs major mode for coding in CSound")
+    (description "Provides both a basic major mode for editing
+CSound files, as well as a REPL for fast feedback when composing
+and sonud-designing.")
+    (license license:gpl3+)))
 
 (define-public emacs-multi
   (package